Cambium Networks PTP 820 Series User Manual page 521

Chapter 9: TDM Services and Interfaces
Configuring the Revertive Timer
1:1 TDM path protection can be configured to operate in revertive mode. In revertive mode, the system monitors
the availability of the protected path at all times. After switchover to the protecting path, once the protected path
is operational and available without any alarms, the system waits for the duration of the user-configured Wait to
Restore (WTR) time and then, if the protected path remains operational and available, initiates a revertive
protection switch. A single WTR time is configured for all the TDM trails in the system. However, trails with 1:1
path protection can be configured individually as revertive or non-revertive.
Note
TDM trails with 1:1 path protection that were configured using software versions prior to T7.9 are
non-revertive.
The Revertive timer must be configured before creating a protecting TDM trail so that the configured
WTR time will be in effect for this trail.
To set the WTR time for trails with revertive 1:1 path protection:
1 Underneath the Native TDM Services table, click Timer Configuration. The TDM Service Revertive Timer
Configuration page opens.
Figure 295 TDM Service Revertive Timer Configuration Page
2 Enter the number, in seconds, for the WTR time. The default value is 10 seconds.
3 Click Apply, then Close.
Adding TDM Trails
To initiate the workflow for adding a TDM trail:
1 Select TDM > Native TDM Services. The Native TDM Services page opens
2 Click Create Service. The Add Native TDM Service workflow begins. The workflow and options provided by
the TDM Services Creation page depends on the selection you make in the Slot/Group/Port field. For
detailed instructions per trail type, see:
o
Adding a Trail between a TDM Port or Protection Group and a Radio Port, a Radio Group, or a Cascading
Interface
o
Adding a Trail between Radio Ports, Radio Groups, or Cascading Interfaces
You cannot add a TDM trail if any of the following conditions exist:
•
There are no available TDM endpoints (E1/DS1s or VC12s).
phn-3965_006v002
Page 9-13
Configuring Native TDM Trails
(Figure 294).